public class Example9_1 {
  public static void main(String args[]) {
       String s1,s2;
       s1=new String("we are students");
       s2=new String("we are students");
       System.out.println(s1.equals(s2));  //输出结果是：true
       System.out.println(s1==s2);         //输出结果是：false
       String s3,s4; 
       s3="how are you";
       s4="how are you"; 
       System.out.println(s3.equals(s4));  //输出结果是：true
       System.out.println(s3==s4);         //输出结果是：true     
    }
}
